/**
 * Copyright 2009 Emory University
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated  documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the 
 * Software is furnished to do so, subject to the following conditions: The 
 * above copyright notice and this permission notice shall be included in all 
 * copies or substantial portions of the Software. 
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
package com.markgrand.structuredSql

/**
 * Trait for classes that append table or column constraints to a builder.
 */
private[structuredSql] trait Constraint extends SQLAppender with SQLIdentifier {
  /**
   * Append the beginning of a column constraint to a builder.
   * 
   * @param constraintName
   *        If this is Some(name), then CONSTRAINT name will be appended to the
   *        builder; otherwise this is None so nothing will be appended.
   * @param builder
   *        The Stringbuilder to append to.
   */
  protected def appendConstraintName(constraintName:Option[String], builder:StringBuilder) {
    if (constraintName.isDefined) {
      builder.append("CONSTRAINT ")
      appendIdentifier(constraintName.get, builder)
    }
  }
}
